1 /* 2 * acerhdf - A driver which monitors the temperature 3 * of the aspire one netbook, turns on/off the fan 4 * as soon as the upper/lower threshold is reached. 5 * 6 * (C) 2009 - Peter Feuerer peter (a) piie.net 7 * http://piie.net 8 * 2009 Borislav Petkov <petkovbb@gmail.com> 9 * 10 * Inspired by and many thanks to: 11 * o acerfand - Rachel Greenham 12 * o acer_ec.pl - Michael Kurz michi.kurz (at) googlemail.com 13 * - Petr Tomasek tomasek (#) etf,cuni,cz 14 * - Carlos Corbacho cathectic (at) gmail.com 15 * o lkml - Matthew Garrett 16 * - Borislav Petkov 17 * - Andreas Mohr 18 * 19 * This program is free software; you can redistribute it and/or modify 20 * it under the terms of the GNU General Public License as published by 21 * the Free Software Foundation; either version 2 of the License, or 22 * (at your option) any later version. 23 * 24 * This program is distributed in the hope that it will be useful, 25 * but WITHOUT ANY WARRANTY; without even the implied warranty of 26 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 27 * GNU General Public License for more details. 28 * 29 * You should have received a copy of the GNU General Public License 30 * along with this program; if not, write to the Free Software 31 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 32 */ 33 34 #define pr_fmt(fmt) "acerhdf: " fmt 35 36 #include <linux/kernel.h> 37 #include <linux/module.h> 38 #include <linux/fs.h> 39 #include <linux/dmi.h> 40 #include <acpi/acpi_drivers.h> 41 #include <linux/sched.h> 42 #include <linux/thermal.h> 43 #include <linux/platform_device.h> 44 45 /* 46 * The driver is started with "kernel mode off" by default. That means, the BIOS 47 * is still in control of the fan. In this mode the driver allows to read the 48 * temperature of the cpu and a userspace tool may take over control of the fan. 49 * If the driver is switched to "kernel mode" (e.g. via module parameter) the 50 * driver is in full control of the fan. If you want the module to be started in 51 * kernel mode by default, define the following: 52 */ 53 #undef START_IN_KERNEL_MODE 54 55 #define DRV_VER "0.5.24" 56 57 /* 58 * According to the Atom N270 datasheet, 59 * (http://download.intel.com/design/processor/datashts/320032.pdf) the 60 * CPU's optimal operating limits denoted in junction temperature as 61 * measured by the on-die thermal monitor are within 0 <= Tj <= 90. So, 62 * assume 89°C is critical temperature. 63 */ 64 #define ACERHDF_TEMP_CRIT 89000 65 #define ACERHDF_FAN_OFF 0 66 #define ACERHDF_FAN_AUTO 1 67 68 /* 69 * No matter what value the user puts into the fanon variable, turn on the fan 70 * at 80 degree Celsius to prevent hardware damage 71 */ 72 #define ACERHDF_MAX_FANON 80000 73 74 /* 75 * Maximum interval between two temperature checks is 15 seconds, as the die 76 * can get hot really fast under heavy load (plus we shouldn't forget about 77 * possible impact of _external_ aggressive sources such as heaters, sun etc.) 78 */ 79 #define ACERHDF_MAX_INTERVAL 15 80 81 #ifdef START_IN_KERNEL_MODE 82 static int kernelmode = 1; 83 #else 84 static int kernelmode; 85 #endif 86 87 static unsigned int interval = 10; 88 static unsigned int fanon = 63000; 89 static unsigned int fanoff = 58000; 90 static unsigned int verbose; 91 static unsigned int fanstate = ACERHDF_FAN_AUTO; 92 static char force_bios[16]; 93 static char force_product[16]; 94 static unsigned int prev_interval; 95 static struct thermal_zone_device *thz_dev; 96 static struct thermal_cooling_device *cl_dev; 97 static struct platform_device *acerhdf_dev; 98 99 module_param(kernelmode, uint, 0); 100 MODULE_PARM_DESC(kernelmode, "Kernel mode fan control on / off"); 101 module_param(interval, uint, 0600); 102 MODULE_PARM_DESC(interval, "Polling interval of temperature check"); 103 module_param(fanon, uint, 0600); 104 MODULE_PARM_DESC(fanon, "Turn the fan on above this temperature"); 105 module_param(fanoff, uint, 0600); 106 MODULE_PARM_DESC(fanoff, "Turn the fan off below this temperature"); 107 module_param(verbose, uint, 0600); 108 MODULE_PARM_DESC(verbose, "Enable verbose dmesg output"); 109 module_param_string(force_bios, force_bios, 16, 0); 110 MODULE_PARM_DESC(force_bios, "Force BIOS version and omit BIOS check"); 111 module_param_string(force_product, force_product, 16, 0); 112 MODULE_PARM_DESC(force_product, "Force BIOS product and omit BIOS check"); 113 114 /* 115 * cmd_off: to switch the fan completely off and check if the fan is off 116 * cmd_auto: to set the BIOS in control of the fan. The BIOS regulates then 117 * the fan speed depending on the temperature 118 */ 119 struct fancmd { 120 u8 cmd_off; 121 u8 cmd_auto; 122 }; 123 124 /* BIOS settings */ 125 struct bios_settings_t { 126 const char *vendor; 127 const char *product; 128 const char *version; 129 unsigned char fanreg; 130 unsigned char tempreg; 131 struct fancmd cmd; 132 }; 133 134 /* Register addresses and values for different BIOS versions */ 135 static const struct bios_settings_t bios_tbl[] = { 136 /* AOA110 */ 137 {"Acer", "AOA110", "v0.3109", 0x55, 0x58, {0x1f, 0x00} }, 138 {"Acer", "AOA110", "v0.3114", 0x55, 0x58, {0x1f, 0x00} }, 139 {"Acer", "AOA110", "v0.3301", 0x55, 0x58, {0xaf, 0x00} }, 140 {"Acer", "AOA110", "v0.3304", 0x55, 0x58, {0xaf, 0x00} }, 141 {"Acer", "AOA110", "v0.3305", 0x55, 0x58, {0xaf, 0x00} }, 142 {"Acer", "AOA110", "v0.3307", 0x55, 0x58, {0xaf, 0x00} }, 143 {"Acer", "AOA110", "v0.3308", 0x55, 0x58, {0x21, 0x00} }, 144 {"Acer", "AOA110", "v0.3309", 0x55, 0x58, {0x21, 0x00} }, 145 {"Acer", "AOA110", "v0.3310", 0x55, 0x58, {0x21, 0x00} }, 146 /* AOA150 */ 147 {"Acer", "AOA150", "v0.3114", 0x55, 0x58, {0x1f, 0x00} }, 148 {"Acer", "AOA150", "v0.3301", 0x55, 0x58, {0x20, 0x00} }, 149 {"Acer", "AOA150", "v0.3304", 0x55, 0x58, {0x20, 0x00} }, 150 {"Acer", "AOA150", "v0.3305", 0x55, 0x58, {0x20, 0x00} }, 151 {"Acer", "AOA150", "v0.3307", 0x55, 0x58, {0x20, 0x00} }, 152 {"Acer", "AOA150", "v0.3308", 0x55, 0x58, {0x20, 0x00} }, 153 {"Acer", "AOA150", "v0.3309", 0x55, 0x58, {0x20, 0x00} }, 154 {"Acer", "AOA150", "v0.3310", 0x55, 0x58, {0x20, 0x00} }, 155 /* Acer 1410 */ 156 {"Acer", "Aspire 1410", "v0.3108", 0x55, 0x58, {0x9e, 0x00} }, 157 {"Acer", "Aspire 1410", "v0.3113", 0x55, 0x58, {0x9e, 0x00} }, 158 {"Acer", "Aspire 1410", "v0.3115", 0x55, 0x58, {0x9e, 0x00} }, 159 {"Acer", "Aspire 1410", "v0.3117", 0x55, 0x58, {0x9e, 0x00} }, 160 {"Acer", "Aspire 1410", "v0.3119", 0x55, 0x58, {0x9e, 0x00} }, 161 {"Acer", "Aspire 1410", "v0.3120", 0x55, 0x58, {0x9e, 0x00} }, 162 {"Acer", "Aspire 1410", "v1.3204", 0x55, 0x58, {0x9e, 0x00} }, 163 {"Acer", "Aspire 1410", "v1.3303", 0x55, 0x58, {0x9e, 0x00} }, 164 {"Acer", "Aspire 1410", "v1.3308", 0x55, 0x58, {0x9e, 0x00} }, 165 {"Acer", "Aspire 1410", "v1.3310", 0x55, 0x58, {0x9e, 0x00} }, 166 /* Acer 1810xx */ 167 {"Acer", "Aspire 1810TZ", "v0.3108", 0x55, 0x58, {0x9e, 0x00} }, 168 {"Acer", "Aspire 1810T", "v0.3108", 0x55, 0x58, {0x9e, 0x00} }, 169 {"Acer", "Aspire 1810TZ", "v0.3113", 0x55, 0x58, {0x9e, 0x00} }, 170 {"Acer", "Aspire 1810T", "v0.3113", 0x55, 0x58, {0x9e, 0x00} }, 171 {"Acer", "Aspire 1810TZ", "v0.3115", 0x55, 0x58, {0x9e, 0x00} }, 172 {"Acer", "Aspire 1810T", "v0.3115", 0x55, 0x58, {0x9e, 0x00} }, 173 {"Acer", "Aspire 1810TZ", "v0.3117", 0x55, 0x58, {0x9e, 0x00} }, 174 {"Acer", "Aspire 1810T", "v0.3117", 0x55, 0x58, {0x9e, 0x00} }, 175 {"Acer", "Aspire 1810TZ", "v0.3119", 0x55, 0x58, {0x9e, 0x00} }, 176 {"Acer", "Aspire 1810T", "v0.3119", 0x55, 0x58, {0x9e, 0x00} }, 177 {"Acer", "Aspire 1810TZ", "v0.3120", 0x55, 0x58, {0x9e, 0x00} }, 178 {"Acer", "Aspire 1810T", "v0.3120", 0x55, 0x58, {0x9e, 0x00} }, 179 {"Acer", "Aspire 1810TZ", "v1.3204", 0x55, 0x58, {0x9e, 0x00} }, 180 {"Acer", "Aspire 1810T", "v1.3204", 0x55, 0x58, {0x9e, 0x00} }, 181 {"Acer", "Aspire 1810TZ", "v1.3303", 0x55, 0x58, {0x9e, 0x00} }, 182 {"Acer", "Aspire 1810T", "v1.3303", 0x55, 0x58, {0x9e, 0x00} }, 183 {"Acer", "Aspire 1810TZ", "v1.3308", 0x55, 0x58, {0x9e, 0x00} }, 184 {"Acer", "Aspire 1810T", "v1.3308", 0x55, 0x58, {0x9e, 0x00} }, 185 {"Acer", "Aspire 1810TZ", "v1.3310", 0x55, 0x58, {0x9e, 0x00} }, 186 {"Acer", "Aspire 1810T", "v1.3310", 0x55, 0x58, {0x9e, 0x00} }, 187 /* Acer 531 */ 188 {"Acer", "AO531h", "v0.3201", 0x55, 0x58, {0x20, 0x00} }, 189 /* Gateway */ 190 {"Gateway", "AOA110", "v0.3103", 0x55, 0x58, {0x21, 0x00} }, 191 {"Gateway", "AOA150", "v0.3103", 0x55, 0x58, {0x20, 0x00} }, 192 {"Gateway", "LT31", "v1.3103", 0x55, 0x58, {0x9e, 0x00} }, 193 {"Gateway", "LT31", "v1.3201", 0x55, 0x58, {0x9e, 0x00} }, 194 {"Gateway", "LT31", "v1.3302", 0x55, 0x58, {0x9e, 0x00} }, 195 /* Packard Bell */ 196 {"Packard Bell", "DOA150", "v0.3104", 0x55, 0x58, {0x21, 0x00} }, 197 {"Packard Bell", "DOA150", "v0.3105", 0x55, 0x58, {0x20, 0x00} }, 198 {"Packard Bell", "AOA110", "v0.3105", 0x55, 0x58, {0x21, 0x00} }, 199 {"Packard Bell", "AOA150", "v0.3105", 0x55, 0x58, {0x20, 0x00} }, 200 {"Packard Bell", "DOTMU", "v1.3303", 0x55, 0x58, {0x9e, 0x00} }, 201 {"Packard Bell", "DOTMU", "v0.3120", 0x55, 0x58, {0x9e, 0x00} }, 202 {"Packard Bell", "DOTMU", "v0.3108", 0x55, 0x58, {0x9e, 0x00} }, 203 {"Packard Bell", "DOTMU", "v0.3113", 0x55, 0x58, {0x9e, 0x00} }, 204 {"Packard Bell", "DOTMU", "v0.3115", 0x55, 0x58, {0x9e, 0x00} }, 205 {"Packard Bell", "DOTMU", "v0.3117", 0x55, 0x58, {0x9e, 0x00} }, 206 {"Packard Bell", "DOTMU", "v0.3119", 0x55, 0x58, {0x9e, 0x00} }, 207 {"Packard Bell", "DOTMU", "v1.3204", 0x55, 0x58, {0x9e, 0x00} }, 208 {"Packard Bell", "DOTMA", "v1.3201", 0x55, 0x58, {0x9e, 0x00} }, 209 {"Packard Bell", "DOTMA", "v1.3302", 0x55, 0x58, {0x9e, 0x00} }, 210 /* pewpew-terminator */ 211 {"", "", "", 0, 0, {0, 0} } 212 }; 213 214 static const struct bios_settings_t *bios_cfg __read_mostly; 215 216 static int acerhdf_get_temp(int *temp) 217 { 218 u8 read_temp; 219 220 if (ec_read(bios_cfg->tempreg, &read_temp)) 221 return -EINVAL; 222 223 *temp = read_temp * 1000; 224 225 return 0; 226 } 227 228 static int acerhdf_get_fanstate(int *state) 229 { 230 u8 fan; 231 232 if (ec_read(bios_cfg->fanreg, &fan)) 233 return -EINVAL; 234 235 if (fan != bios_cfg->cmd.cmd_off) 236 *state = ACERHDF_FAN_AUTO; 237 else 238 *state = ACERHDF_FAN_OFF; 239 240 return 0; 241 } 242 243 static void acerhdf_change_fanstate(int state) 244 { 245 unsigned char cmd; 246 247 if (verbose) 248 pr_notice("fan %s\n", (state == ACERHDF_FAN_OFF) ? 249 "OFF" : "ON"); 250 251 if ((state != ACERHDF_FAN_OFF) && (state != ACERHDF_FAN_AUTO)) { 252 pr_err("invalid fan state %d requested, setting to auto!\n", 253 state); 254 state = ACERHDF_FAN_AUTO; 255 } 256 257 cmd = (state == ACERHDF_FAN_OFF) ? bios_cfg->cmd.cmd_off 258 : bios_cfg->cmd.cmd_auto; 259 fanstate = state; 260 261 ec_write(bios_cfg->fanreg, cmd); 262 } 263 264 static void acerhdf_check_param(struct thermal_zone_device *thermal) 265 { 266 if (fanon > ACERHDF_MAX_FANON) { 267 pr_err("fanon temperature too high, set to %d\n", 268 ACERHDF_MAX_FANON); 269 fanon = ACERHDF_MAX_FANON; 270 } 271 272 if (kernelmode && prev_interval != interval) { 273 if (interval > ACERHDF_MAX_INTERVAL) { 274 pr_err("interval too high, set to %d\n", 275 ACERHDF_MAX_INTERVAL); 276 interval = ACERHDF_MAX_INTERVAL; 277 } 278 if (verbose) 279 pr_notice("interval changed to: %d\n", 280 interval); 281 thermal->polling_delay = interval*1000; 282 prev_interval = interval; 283 } 284 } 285 286 /* 287 * This is the thermal zone callback which does the delayed polling of the fan 288 * state. We do check /sysfs-originating settings here in acerhdf_check_param() 289 * as late as the polling interval is since we can't do that in the respective 290 * accessors of the module parameters. 291 */ 292 static int acerhdf_get_ec_temp(struct thermal_zone_device *thermal, 293 unsigned long *t) 294 { 295 int temp, err = 0; 296 297 acerhdf_check_param(thermal); 298 299 err = acerhdf_get_temp(&temp); 300 if (err) 301 return err; 302 303 if (verbose) 304 pr_notice("temp %d\n", temp); 305 306 *t = temp; 307 return 0; 308 } 309 310 static int acerhdf_bind(struct thermal_zone_device *thermal, 311 struct thermal_cooling_device *cdev) 312 { 313 /* if the cooling device is the one from acerhdf bind it */ 314 if (cdev != cl_dev) 315 return 0; 316 317 if (thermal_zone_bind_cooling_device(thermal, 0, cdev)) { 318 pr_err("error binding cooling dev\n"); 319 return -EINVAL; 320 } 321 return 0; 322 } 323 324 static int acerhdf_unbind(struct thermal_zone_device *thermal, 325 struct thermal_cooling_device *cdev) 326 { 327 if (cdev != cl_dev) 328 return 0; 329 330 if (thermal_zone_unbind_cooling_device(thermal, 0, cdev)) { 331 pr_err("error unbinding cooling dev\n"); 332 return -EINVAL; 333 } 334 return 0; 335 } 336 337 static inline void acerhdf_revert_to_bios_mode(void) 338 { 339 acerhdf_change_fanstate(ACERHDF_FAN_AUTO); 340 kernelmode = 0; 341 if (thz_dev) 342 thz_dev->polling_delay = 0; 343 pr_notice("kernel mode fan control OFF\n"); 344 } 345 static inline void acerhdf_enable_kernelmode(void) 346 { 347 kernelmode = 1; 348 349 thz_dev->polling_delay = interval*1000; 350 thermal_zone_device_update(thz_dev); 351 pr_notice("kernel mode fan control ON\n"); 352 } 353 354 static int acerhdf_get_mode(struct thermal_zone_device *thermal, 355 enum thermal_device_mode *mode) 356 { 357 if (verbose) 358 pr_notice("kernel mode fan control %d\n", kernelmode); 359 360 *mode = (kernelmode) ? THERMAL_DEVICE_ENABLED 361 : THERMAL_DEVICE_DISABLED; 362 363 return 0; 364 } 365 366 /* 367 * set operation mode; 368 * enabled: the thermal layer of the kernel takes care about 369 * the temperature and the fan. 370 * disabled: the BIOS takes control of the fan. 371 */ 372 static int acerhdf_set_mode(struct thermal_zone_device *thermal, 373 enum thermal_device_mode mode) 374 { 375 if (mode == THERMAL_DEVICE_DISABLED && kernelmode) 376 acerhdf_revert_to_bios_mode(); 377 else if (mode == THERMAL_DEVICE_ENABLED && !kernelmode) 378 acerhdf_enable_kernelmode(); 379 380 return 0; 381 } 382 383 static int acerhdf_get_trip_type(struct thermal_zone_device *thermal, int trip, 384 enum thermal_trip_type *type) 385 { 386 if (trip == 0) 387 *type = THERMAL_TRIP_ACTIVE; 388 389 return 0; 390 } 391 392 static int acerhdf_get_trip_temp(struct thermal_zone_device *thermal, int trip, 393 unsigned long *temp) 394 { 395 if (trip == 0) 396 *temp = fanon; 397 398 return 0; 399 } 400 401 static int acerhdf_get_crit_temp(struct thermal_zone_device *thermal, 402 unsigned long *temperature) 403 { 404 *temperature = ACERHDF_TEMP_CRIT; 405 return 0; 406 } 407 408 /* bind callback functions to thermalzone */ 409 static struct thermal_zone_device_ops acerhdf_dev_ops = { 410 .bind = acerhdf_bind, 411 .unbind = acerhdf_unbind, 412 .get_temp = acerhdf_get_ec_temp, 413 .get_mode = acerhdf_get_mode, 414 .set_mode = acerhdf_set_mode, 415 .get_trip_type = acerhdf_get_trip_type, 416 .get_trip_temp = acerhdf_get_trip_temp, 417 .get_crit_temp = acerhdf_get_crit_temp, 418 }; 419 420 421 /* 422 * cooling device callback functions 423 * get maximal fan cooling state 424 */ 425 static int acerhdf_get_max_state(struct thermal_cooling_device *cdev, 426 unsigned long *state) 427 { 428 *state = 1; 429 430 return 0; 431 } 432 433 static int acerhdf_get_cur_state(struct thermal_cooling_device *cdev, 434 unsigned long *state) 435 { 436 int err = 0, tmp; 437 438 err = acerhdf_get_fanstate(&tmp); 439 if (err) 440 return err; 441 442 *state = (tmp == ACERHDF_FAN_AUTO) ? 1 : 0; 443 return 0; 444 } 445 446 /* change current fan state - is overwritten when running in kernel mode */ 447 static int acerhdf_set_cur_state(struct thermal_cooling_device *cdev, 448 unsigned long state) 449 { 450 int cur_temp, cur_state, err = 0; 451 452 if (!kernelmode) 453 return 0; 454 455 err = acerhdf_get_temp(&cur_temp); 456 if (err) { 457 pr_err("error reading temperature, hand off control to BIOS\n"); 458 goto err_out; 459 } 460 461 err = acerhdf_get_fanstate(&cur_state); 462 if (err) { 463 pr_err("error reading fan state, hand off control to BIOS\n"); 464 goto err_out; 465 } 466 467 if (state == 0) { 468 /* turn fan off only if below fanoff temperature */ 469 if ((cur_state == ACERHDF_FAN_AUTO) && 470 (cur_temp < fanoff)) 471 acerhdf_change_fanstate(ACERHDF_FAN_OFF); 472 } else { 473 if (cur_state == ACERHDF_FAN_OFF) 474 acerhdf_change_fanstate(ACERHDF_FAN_AUTO); 475 } 476 return 0; 477 478 err_out: 479 acerhdf_revert_to_bios_mode(); 480 return -EINVAL; 481 } 482 483 /* bind fan callbacks to fan device */ 484 static struct thermal_cooling_device_ops acerhdf_cooling_ops = { 485 .get_max_state = acerhdf_get_max_state, 486 .get_cur_state = acerhdf_get_cur_state, 487 .set_cur_state = acerhdf_set_cur_state, 488 }; 489 490 /* suspend / resume functionality */ 491 static int acerhdf_suspend(struct device *dev) 492 { 493 if (kernelmode) 494 acerhdf_change_fanstate(ACERHDF_FAN_AUTO); 495 496 if (verbose) 497 pr_notice("going suspend\n"); 498 499 return 0; 500 } 501 502 static int __devinit acerhdf_probe(struct platform_device *device) 503 { 504 return 0; 505 } 506 507 static int acerhdf_remove(struct platform_device *device) 508 { 509 return 0; 510 } 511 512 static const struct dev_pm_ops acerhdf_pm_ops = { 513 .suspend = acerhdf_suspend, 514 .freeze = acerhdf_suspend, 515 }; 516 517 static struct platform_driver acerhdf_driver = { 518 .driver = { 519 .name = "acerhdf", 520 .owner = THIS_MODULE, 521 .pm = &acerhdf_pm_ops, 522 }, 523 .probe = acerhdf_probe, 524 .remove = acerhdf_remove, 525 }; 526 527 /* checks if str begins with start */ 528 static int str_starts_with(const char *str, const char *start) 529 { 530 unsigned long str_len = 0, start_len = 0; 531 532 str_len = strlen(str); 533 start_len = strlen(start); 534 535 if (str_len >= start_len && 536 !strncmp(str, start, start_len)) 537 return 1; 538 539 return 0; 540 } 541 542 /* check hardware */ 543 static int acerhdf_check_hardware(void) 544 { 545 char const *vendor, *version, *product; 546 const struct bios_settings_t *bt = NULL; 547 548 /* get BIOS data */ 549 vendor = dmi_get_system_info(DMI_SYS_VENDOR); 550 version = dmi_get_system_info(DMI_BIOS_VERSION); 551 product = dmi_get_system_info(DMI_PRODUCT_NAME); 552 553 if (!vendor || !version || !product) { 554 pr_err("error getting hardware information\n"); 555 return -EINVAL; 556 } 557 558 pr_info("Acer Aspire One Fan driver, v.%s\n", DRV_VER); 559 560 if (force_bios[0]) { 561 version = force_bios; 562 pr_info("forcing BIOS version: %s\n", version); 563 kernelmode = 0; 564 } 565 566 if (force_product[0]) { 567 product = force_product; 568 pr_info("forcing BIOS product: %s\n", product); 569 kernelmode = 0; 570 } 571 572 if (verbose) 573 pr_info("BIOS info: %s %s, product: %s\n", 574 vendor, version, product); 575 576 /* search BIOS version and vendor in BIOS settings table */ 577 for (bt = bios_tbl; bt->vendor[0]; bt++) { 578 /* 579 * check if actual hardware BIOS vendor, product and version 580 * IDs start with the strings of BIOS table entry 581 */ 582 if (str_starts_with(vendor, bt->vendor) && 583 str_starts_with(product, bt->product) && 584 str_starts_with(version, bt->version)) { 585 bios_cfg = bt; 586 break; 587 } 588 } 589 590 if (!bios_cfg) { 591 pr_err("unknown (unsupported) BIOS version %s/%s/%s, " 592 "please report, aborting!\n", vendor, product, version); 593 return -EINVAL; 594 } 595 596 /* 597 * if started with kernel mode off, prevent the kernel from switching 598 * off the fan 599 */ 600 if (!kernelmode) { 601 pr_notice("Fan control off, to enable do:\n"); 602 pr_notice("echo -n \"enabled\" > " 603 "/sys/class/thermal/thermal_zone0/mode\n"); 604 } 605 606 return 0; 607 } 608 609 static int acerhdf_register_platform(void) 610 { 611 int err = 0; 612 613 err = platform_driver_register(&acerhdf_driver); 614 if (err) 615 return err; 616 617 acerhdf_dev = platform_device_alloc("acerhdf", -1); 618 if (!acerhdf_dev) { 619 err = -ENOMEM; 620 goto err_device_alloc; 621 } 622 err = platform_device_add(acerhdf_dev); 623 if (err) 624 goto err_device_add; 625 626 return 0; 627 628 err_device_add: 629 platform_device_put(acerhdf_dev); 630 err_device_alloc: 631 platform_driver_unregister(&acerhdf_driver); 632 return err; 633 } 634 635 static void acerhdf_unregister_platform(void) 636 { 637 platform_device_unregister(acerhdf_dev); 638 platform_driver_unregister(&acerhdf_driver); 639 } 640 641 static int acerhdf_register_thermal(void) 642 { 643 cl_dev = thermal_cooling_device_register("acerhdf-fan", NULL, 644 &acerhdf_cooling_ops); 645 646 if (IS_ERR(cl_dev)) 647 return -EINVAL; 648 649 thz_dev = thermal_zone_device_register("acerhdf", 1, NULL, 650 &acerhdf_dev_ops, 0, 0, 0, 651 (kernelmode) ? interval*1000 : 0); 652 if (IS_ERR(thz_dev)) 653 return -EINVAL; 654 655 return 0; 656 } 657 658 static void acerhdf_unregister_thermal(void) 659 { 660 if (cl_dev) { 661 thermal_cooling_device_unregister(cl_dev); 662 cl_dev = NULL; 663 } 664 665 if (thz_dev) { 666 thermal_zone_device_unregister(thz_dev); 667 thz_dev = NULL; 668 } 669 } 670 671 static int __init acerhdf_init(void) 672 { 673 int err = 0; 674 675 err = acerhdf_check_hardware(); 676 if (err) 677 goto out_err; 678 679 err = acerhdf_register_platform(); 680 if (err) 681 goto out_err; 682 683 err = acerhdf_register_thermal(); 684 if (err) 685 goto err_unreg; 686 687 return 0; 688 689 err_unreg: 690 acerhdf_unregister_thermal(); 691 acerhdf_unregister_platform(); 692 693 out_err: 694 return err; 695 } 696 697 static void __exit acerhdf_exit(void) 698 { 699 acerhdf_change_fanstate(ACERHDF_FAN_AUTO); 700 acerhdf_unregister_thermal(); 701 acerhdf_unregister_platform(); 702 } 703 704 MODULE_LICENSE("GPL"); 705 MODULE_AUTHOR("Peter Feuerer"); 706 MODULE_DESCRIPTION("Aspire One temperature and fan driver"); 707 MODULE_ALIAS("dmi:*:*Acer*:pnAOA*:"); 708 MODULE_ALIAS("dmi:*:*Acer*:pnAspire 1410*:"); 709 MODULE_ALIAS("dmi:*:*Acer*:pnAspire 1810*:"); 710 MODULE_ALIAS("dmi:*:*Acer*:pnAO531*:"); 711 MODULE_ALIAS("dmi:*:*Gateway*:pnAOA*:"); 712 MODULE_ALIAS("dmi:*:*Gateway*:pnLT31*:"); 713 MODULE_ALIAS("dmi:*:*Packard Bell*:pnAOA*:"); 714 MODULE_ALIAS("dmi:*:*Packard Bell*:pnDOA*:"); 715 MODULE_ALIAS("dmi:*:*Packard Bell*:pnDOTMU*:"); 716 MODULE_ALIAS("dmi:*:*Packard Bell*:pnDOTMA*:"); 717 718 module_init(acerhdf_init); 719 module_exit(acerhdf_exit); 720